Historical clue formulations

• Neighbor of Croatia — 2024-12-03
• Balkan region — 2021-10-17
• Banja Luka is its second-largest city — 2015-11-07
• Balkan land — 2013-02-20
• 1990s war site — 2010-10-03
• Neighbor of Croatia — 2008-06-16
• 1990s war site — 2008-06-11
• Sarajevo is its capital — 2003-03-24
• Neighbor of Montenegro — 1996-10-17